Feeding pump device of volume tube continually metering type

ABSTRACT

A feeding pump device of volume tube continually metering type comprises: a volume tube ( 1 ) provided with metering volume section ( 11 ), a dragging mechanism ( 2 ), and an unilateral inlet valve ( 8 ) and an unilateral outlet valve ( 7 ). Said volume tube ( 1 ) particularly have two unilateral inlet valves ( 8 ) and two unilateral outlet valves ( 7 ) provided in two ends of inner wall thereof respectively. A piston ( 9 ) connected to the said dragging mechanism ( 2 ) is provided in said volume tube ( 1 ). The present invention provides a design scheme of feeding pump, of which metering mode is based on measuring displacement of the piston, and takes reciprocation times of the piston as computation base. The unit of metering is the product of minimal distinguish unit of grating ruler and cross section area of metering volume section of the volume tube, and the pump has both the function of the conventional volume tube device and medium metering type feeding pump and develops it.

BACKGROUND OF THE INVENTION

This invention is involved with a device of feeding pump device ofmetering type, especially involved with a device of metering typefeeding pump that can be used to measure the definite-quantity outputand the flow of the liquid media, to demarcate the container volume andto calibrate the measurement instruments and devices of the liquidmedium flow.

The volume tube device known has no option but to conduct the metrologyfor part of medium passing through the volume tube device, whereascannot conduct the definite-quantity output and metrology for all mediumpassing through the volume tube device. A known feeding pump metrologydevice such as a volume tube flow meter disclosed in Chinese Patent90200439.5 has no option but to conduct the definite-quantity output forthe medium whose flow is relatively small, and the minimum measuringunit normally is a fixed volume, and the size of the minimum unitdetermines the measurement deviation; such device conducting themeasurement by means of measuring the volume delivery number cannotcarry out the definite-quantity output and measurement for the mediumwhose flow is relatively mass.

BRIEF SUMMARY OF THE INVENTION

In order to overcome the shortage that the known volume tube devicecannot carry out the definite-quantity output and measurement for allmedium passing through the volume tube device and the shortage that theknown volume tube device is deficient in conducting thedefinite-quantity output and measurement for the medium whose flow isrelatively mass, the purpose of this invention is to provide such adesign plan of volume tube delivery measurement device: its measurementmethod is on a basis of measuring the piston displacement, itscalculation basis is using reciprocating piston number and pistondisplacement quantity, and its measurement unit is a product of theminimum resolution unit of the grating ruler and the cross section areaof volume tube measurement volume, so as to combine and develop thefunctions of the traditional volume tube device and the mediummeasurement feeding pump.

The purpose of this invention can be reached through using the followingtechnical measures: design and manufacture a continuous feeding pumpdevice of volume tube, including volume tube and its dragging mechanism;a measurement volume zone, unilateral liquid inlet valves, andunilateral liquid outlet valves are set in the mentioned volume tube; inespecial, the mentioned volume tube has each two of unilateral liquidinlet valves and unilateral liquid outlet valves, respectively set attwo ends of the inner walls of the mentioned volume tube; a piston isalso set in the mentioned volume tube, and the piston is used to connectthe mentioned dragging mechanism.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structure diagram of continuous feeding pump device ofvolume tube of this invention.

FIG. 2 is a structure diagram of the mentioned continuous feeding pumpdevice of volume tube using linear motor.

FIG. 3 is a timing sequence diagram of lead screw rotation speed andvalve lifts of the mentioned continuous feeding pump device.

DETAILED DESCRIPTION OF THE INVENTION

Combined with the attached drawings, the preferred embodiments of thisinvention are described in detail as follows:

A continuous feeding pump device of volume tube includes volume tube 1and dragging mechanism 2, where measurement volume zone 11, unilateralliquid inlet valve 8 and unilateral liquid outlet valve 7 are set in thementioned volume tube 1; in especial, the mentioned volume tube 1 hastwo unilateral liquid inlet valves and two unilateral liquid outletvalves, respectively set in two ends of inner walls of the mentionedvolume tube 1; a piston 9 is also set in the mentioned volume tube; thepiston 9 is connected with the mentioned dragging mechanism 2.

Agrating ruler 4 located on the moving route of dragging rod of thementioned piston 9 is also set in the mentioned continuous feeding pumpdevice of volume tube.

The mentioned dragging mechanism 2 can be a servo motor device includingservo motor 22, belt gear 21, lead screw 23 and lead screw nut 25, whichare connected in turn; and it can also be a linear motor.

For the one using servo motor device, casing pipe 6 of lead screw isconnected with the mentioned piston 9 at the outside of the mentionedlead screw 23. The lead screw can be rotated in the casing pipe of leadscrew connected with the piston.

There are two kinds of concrete methods. One, using the ball screw turnsthe rotation movement of the motor into the rectilinear movement of thepiston; passing each respective inlet and outlet unilateral valve, themeasurement volume at two sides of the piston is quantitativelyoutputted and measured one time in a moving period of the piston.Another, using the linear motor to drive the piston conducting therectilinear movement, and passing each respective inlet and outletunilateral valve, the measurement volume at two sides of the piston isquantitatively outputted and measured one time in a moving period of thepiston.

The main advantages of this invention are: not only can conduct thequantitative output and measurement for all media passing through thefeeding pump device of volume tube, but also can conduct theself-adaptive control for the medium flow of the customer pipelinesystem through the control measurement system of the feeding pump deviceof volume tube, making it own a good match with the medium flow of thecustomer pipeline system; the functions of the active and passivefeeding pump devices of volume tube are integrated, the range of thequantitative output and measurement of the medium flow is greatlywidened, the measurement devices of the liquid medium flow can bedetected in situ, and the functions of the traditional volume tubedevices and the medium measurement feeding pump are combined anddeveloped. The corrosion due to connection between the lead screw andthe medium to be detected is avoided in that the structure of protectingthe lead screw through its casing pipe connected with the piston isused, which is convenient to lubricating and cooling the lead screw. Thedragging mechanism is relatively simple as compared with that of thetraditional volume tube devices. And the medium flow is bigger comparingwith that of the traditional measurement feeding pump devices.

In some embodiments, like what is shown in FIG. 1 for the structure offeeding pump device of volume tube, servo motor 22 is rotated throughbelt gear 21 driving lead screw 23, lead screw 23 drags piston 9conducting the reciprocating motion in volume tube measurement volume 11by lead screw nut 25 and casing pipe 6 of lead screw, the detectedmedium from liquid inlet pipe 12 passes liquid inlet unilateral valve 8into volume tube measurement volume 11, the detected medium passesliquid outlet unilateral valve 7 and falls from volume tube measurementvolume 11 into liquid outlet pipe 10, and then the output quantity ofthe medium can be calculated after precisely measuring the pistonposition by using grating ruler 4. This device uses a structure designthat the piston in the volume tube is driven by a ball screw dragged bythe motor and that the rotation motion of the motor is turned into thereciprocating rectilinear motion using the ball screw.

A limit micro-switch can be set at the end to ensure the precisereciprocating measurement at each time. Each measurement result isimputed to the computer to conduct the precise statistic andcalculation, so as to ensure the measuring accuracy of flow and volume.

In the other embodiments, like what is shown in FIG. 2 for the structureof the measurement feeding pump device of volume tube, linear motor 2drives piston 9 conducting the reciprocating motion in volume tubemeasurement volume 11, the detected medium falls into volume tubemeasurement volume 11 from liquid inlet pipe 12 and liquid inletunilateral valve 8, the detected medium bleeds off volume tubemeasurement volume 11 through liquid outlet unilateral valve 7 and fallsinto liquid outlet pipe 10, and then calculate the medium outputquantity after conducting the precise measurement for the pistonposition using grating ruler 4.

The operation mode of volume tube measurement pump device is both-wayquantitative output liquid, i.e., when the piston moves towards volumeA, the liquid in volume A passes through the unilateral liquid outletvalve and quantitatively bleeds off the liquid to the cylinder outside,at the same time, volume B passes through the unilateral liquid inletvalve and quantitatively feeds the liquid from the cylinder outside;when the piston moves towards volume B, the liquid in volume B passesthrough the unilateral liquid outlet valve and quantitatively bleeds offthe liquid to the cylinder outside, at the same time, volume A passesthrough the unilateral liquid inlet valve and quantitatively feeds theliquid from the cylinder outside; in this way, the function of both-wayquantitative output liquid can be realized by means of the reciprocatingmotion of the piston.

The switch time sequence of ingress and egress of the unilateral valveof the feeding pump device of volume tube is: when the piston movestowards volume B and reaches the dead point, turn off the unilateralliquid inlet valve of side B after an interval of t_(x), andsimultaneously turn off the unilateral liquid inlet valve of side A;after an interval of t_(y), turn on the unilateral liquid inlet valve ofside B, and simultaneously turn on the unilateral liquid inlet valve ofside A; after an interval of t_(z), the piston moves towards volume Athrough counter revolution of the lead screw, when the piston reachesthe dead point, turn off the unilateral liquid inlet valve of side Bafter an interval of t_(z), and simultaneously turn off the unilateralliquid inlet valve of side A; after an interval of t_(y), turn on theunilateral liquid inlet valve of side B, and simultaneously turn on theunilateral liquid inlet valve of side A; so the piston and the inlet andoutlet liquid unilateral valve conduct such reciprocating cycle motion.The time interval from the piston stop to the next movement is t second,and t=t_(x)+t_(y)+t_(z). The time sequence relation among the leadscrew, the piston and the unilateral liquid inlet and outlet valves areshown in FIG. 3.

1. A feeding pump device of volume tube continually metering typecomprises: a volume tube (1) provided with metering volume section (11),a dragging mechanism (2), and an unilateral inlet valve (8) and anunilateral outlet valve (7). Said volume tube (1) particularly have twounilateral inlet valves (8) and two unilateral outlet valves (7)provided in two ends of inner wall thereof respectively. A piston (9)connected to the said dragging mechanism (2) is provided in said volumetube (1).
 2. A feeding pump device of volume tube continually meteringtype of claim 1, wherein a grating R(4) is also set on the moving routeof the dragging rod of the mentioned piston (9).
 3. A feeding pumpdevice of volume tube continually metering type of claim 1, wherein thementioned dragging mechanism (2) also includes servo motor (22), beltgear (21), lead screw (23) and lead screw nut (25), which is connectedin turn.
 4. A feeding pump device of volume tube continually meteringtype of claim 1, wherein a casing pipe (6) of lead screw connected withthe mentioned piston (9) is set at the outside of mentioned lead screw(23)
 5. A feeding pump device of volume tube continually metering typeof claim 1, wherein the mentioned dragging mechanism (2) is a linearmotor.